Apparatus for delivery of fluids to burners



April 3, 1928. 1,665,145

G. M. PELTZ APPARATUS FOR DELIVERY OF FLUIDS T0 aunmms Filed Jan. 25, 1924 5 sheets-Sheet 2 Pe ltz INVENTOR ATTORNEYS April s.

G. M. TZ

APPARATUS FOR DELIVERY OF FLUIDS T0 BURNERS Filed Jan. 25. 1924 5 $heet t 3 v MPeLtz INVE OR M. A. ATTORNEYS April'3, 1928.

' v G. M. PELTZ I APPARATUS FOR DELIVERY OF FLUIDS TO BURNERS Filed Jan. 25. 1924 s Sheets-Sheet- 4 ATTORNEYS y INVE(NTOR I Gordon/ll PeZtz. BY

April 3, 1928. v 1,665,145

G. M; PELTZ APPARATIIIS FOR DELIVERY! OF FLUIDS T0 BURNERS Filed Jan. 25, 1924 5 Sheets-Sheet 5 m g Q 1 Patented' A pr. 3, 192a.

ema- STATES;

ooanoiv m.

or ooanme, new YORK, A conroaa'rron or raw roux. I

rarer oFFi .arraaa'rps r03 DELIVERY or FLUIDS 'ro Bunirnns.

Application filed January 25,1924. Serial No. 688,462.

This invention relates to apparatus for maintaining proportional dellvery of combustible fluids and air supplied through separate passages to burners, notwithstanding variations in the resistance to the flow of these fluids or in their relative pressures.

I am aware that there are many different types of liquid fuel burners which depend for their operation upon the use of compressed air or steam for breaking up or atomizing the combustible fluids. Such burners rely upon the high velocity of the resulting stream of air and atomized fluid to draw into the burner the necessary air for combustion. In such burners the proportion of air*, to combustiblefluidused depends upon the adi'ustment of the fluid and compressed air va ves;

One object of my present invention is to provide an apparatus which is so designed that the proportion of combustible fluid and air admitted'to a burner is automatically controlled, and the ratio ofthese fluids is -kept constantly at any desired point regardless of the quantity of the fuel being burned: a

It is a further object of my invention to make the flow ofcombustible fluid dependent only on the flow of air admitted to the burner,.regardless of back pressure or suc-' tion in the burner, or of resistances in th burner supply pipe.

An apparatus according to my invention consists essentially of two main parts, namely, a feeder for the air which is inserted in a compressed air line to a burner, and a feeder for the fuel which is inserted in the fuel line between a valve and the burner.

The feeder for the air comprises a conventional Venturi throat having mounted therein an adjustable Pitot tube aiming down stream and has no moving parts. Its function is to obtain a pressure diflerence dependent upon the amount of air flowing to the burner without restricting the flow,

and to actuate the feeder for the fuel acdiaphragm in such manner asvto maintain a fuel pressure in this chamber equal to the air pressure communicated to the outside of the diaphragm from the feeder for the air. From this chamber the fuel passes through the orifice into the other chamber and out to the burner through another valve actuated by another diaphragm in such manner as to check the escape of the fuel so as to maintain a fuel pressure in this chamber equal to the air pressure-communicated to its diaphragm from the feeder for the air.

With the above and other objects in view 'Which will appear as the description progresses, my invention consists of the novel construction, combination and arrangement 1 of parts more fully described in the following specification and articularly pointed out in.the appended c aims,

In the accompanying drawings Flgure 1, is an elevation, partly in section of an apparatus constructed according to the preferred embodiment of my invenion;

Figure 2, is an enlarged view, partly in sectlon, of the upper portion of the apparatus shown in Figure 1, through which the air is delivered to the burner, the cut-off valve being shown in normal operating position;

Figure 3, is a detail'sectional View of the cut-off valve, the valve being shown in operative position;

Figure 4, is a similar view, showing the valve in inoperative position; 1

Figure 5, is a transverse section, taken on the line 55 of Figure 2; t

Figure 6, is a section taken on the line.

portion of Figure 9, is an enlarged detail section I taken on the line 99 of Figure 8;

Figure 10, is a transverse section taken approximately .on the line 1010 of Figure 1, parts being broken away to show the underlying structure;

Figure 11, is a section taken on the line 11--11 of Figure Figure 12, is a transverse section taken approximately on the line 1212 of Figure 1, parts being broken away to show the underlying'structure, and

F1 ure 13, is a section ul'ar ine 13-'13 of Figure 8.

Referring to the drawings, and particularly to Figure 1, the apparatus includes a burner 1, of any ap rovp'd type, which is supplied with air un er pressure throu h a pipe 2, and also with a combustible, uid,

I such as fuel oil, through a pipe 3. A suitable valve 4 is mounted in the pipe 2 behind the burner for the purpose of controlling the amount of air delivered'through the pipe to the burner. It is to be understood that throughout the following description, steam can be substituted for air as the atomizing medium, without altering the construction or operation of the apparatus.

The air feeder.

Mounted in the air line at a convenient point from the burner 1, is a'feeder 5 for the air, which willbe hereinafter more fully described, while interposed in the fuel line, also at a convenient point from the burner 1 and also adjacent to the feeder 5, is a device 6 for feeding the fuel to the burner.

' As will be later on pointed out, the air feeder 5 is connected to the fuel feeder 6 so that the amount of fuel delivered to the burner 1 will be automatically controlled by the amount of air passing through the pipe 2.

The air feeder 5 is provided with a chamber A, of hollow cylindrical form, the chamber being closed toatmosphere. Threaded 'into the bottom of the chamber is an air Venturi throat 11, having a small flared end 12 positioned adjacent to the rear end of the chamber, and its opposite enlarged end 13 "threaded into the front end of the chamber.

The air pipe 2 from the burner 1 is threaded into the end 13 of the Venturi throat 11. When the valve 8 is open, the air will-flow from the chamber A, through the Venturi throat 11, into the pipe 2. The Venturi throat has an area of two to three times the area of the air opening in the burner, and

/ so the pressure drop through it will be relataken on the irregtively small. For this condition, the flow of air through the venturi is substantially the same as for a non-expansive fluid, and so for all practical pur oses the simple Venturilaws can be According to these laws, neglecting friction, the total head of pressure at an point in the venturi will always be equa to the sum of thestatic and velocity heads, and this sum will be aconstant, equal. to the pressure at the Venturi entrance. 'Referrin the drawings, it will be noticed that for any point in the Venturi throat 11, such as is indicated at X, the static head plus the velocity head e uals the total head, and therefore equals t e pressure inchambe'r- A, ,or the static head at X, equals the pressurein chamber A, minus the velocity head at X.

Formed integral with, but spaced from the chamber A of the air-feeder 5, is another chamber B, a wall 14 separatin the two chambers. Projecting into the en 12 of the Venturi-throat 11,. is a Pitot tube 15 that isprovided with a shank 16 threaded into the rear wall 17 of thechamber B. The outer extremity of the shank 16 is provided with a head 18 carrying oppositely extending arms by means of which the tube 15 can be manually moved in or out of the air feeder. Interposedon the shank 16 between the head 1 18 and'the wall 17 is a nut 19, formed similarly to the head 18. By means of this nut, .the tube can be locked after its tip has been adjusted to the desired position with respect to the Venturi throat 11. The portion of now to Figure 2, of

the tube 15 that extends from the chamber B, through the wall 14 into the end 12 of the Venturi throat 11, is hollow and the. end of the tube that lies in the chamber B, is provided with transverse passages 20 (see Figure 2)-. This construction enables the chamber B to be in communication with the Venturi throat in chamber A. A stufling box 21'surrounds the portion of the Pitot tube 15 that'extends through the wall 14, so as to prevent leakage of the fluids from one chamber to the other. v

By this construction, it will be readily seen, that the Pitot tube 15, which points down stream in the .Venturi throat 11, can be adjusted fromthe outside so that its tip can be put at any desired position such as X.

The fuel'feeder.

The fuel feeder 6 is preferably composed of three hollow castings; namely, an annular central portion 22, and opposite end castings 23 and 24 which are bolted to the portion 22. These castings, when assembled, form a housing for all of the mechanism comprisin the fuel feeder.

When t e ends 23 and 24 are bein assembled onto the central portion 22, p ates 25 and 26, which serve as gaskets are used.

' These plates divide the interior of the housthe chamber E, may be terme Y irregularly.

ing into a plurality of chambers, those in the ends 23 and 24, being designated as C and D, respectively, wh1le in the central portion are two chambers E and F, that are separated by'a web 27 formed integrally in the casting. The chamber C, to ether with the inlet chamber in which the pressure responsive device 39, to be hereinafter described is mounted, and the chamber D, together with the chamber F, may be termed the outlet chamber in which the pressure responsive device 66 also' to be hereinafter described, is mounted.

Chambers A and B of the air feeder 5 are connected to chambers C and D of the fuel feeder 6 by pipes 28 and 29 respectively. Fixed to the ends of these pipes, where such pipes enter the chambers C an D are discs 30, each having a small open ing 31 therein. The purpose of these discs is to permit the pressure from the air feed or 5 to be communicated to chambers C and D, but to check any tendency for a rapid surging back and forth of the air. which surging would cause the burner to' operate Mounted in the pipe 29 adjacent to the air feeder having two ports 33 and 34 which are actuated by a key 35 (indicated by broken lines in Figures 3 and 4). \Vhen the key ing 35 is in substantially a horizontal position (see Figures 1, 2 and 3) port 33 of the valve will be so disposed that the air can flow directly through the pipe 29 connecting chambers B and D. This is the normal operatosition. When the key 35 is thrown upwardly, as is illustrated by Figure-,4, port 33 will be "moved out of registration with the ends of the pipe 29, and port 34 will be so disposed that chamber B is sealed and chamber D is opened to atmosphere through a port 36 formed in the top of the valve. The purpose of this will be hereinafter more fully described.

The pipe 3 from the burner 1 is connected to a chamber G formed in the top of the central portion 22 of the fuel feeder 6, while a pipe 37, leading from the source of fuel supply is connected to a chamber H formed in the bottom of the central portion 22. The chamber G communicates with chamber F, while the chamber H communicates with chamber E. However, valves are interposed between each of these pairs of chambers to control. the flow of fluid therebetween. These valves are designed to be actuated throu mechanism to be hereinafter describe l, so that fuel, upon entering the chamber H from the supply pipe 37, is admitted to chamber E, and from such chamber passes into chamber F, in a manner to be presently described, and thence into chamber G and into the pipe 3 leadmg to 5 is a cut-off valve 32,.

the burner. 1, the fuel being fed into the burner in the'desired proportion to theair flowing into the burner from the air feeder 5. A valve 38 is placed at any point in the pipe 37 ad acent to the fuel feeder 6 for the purpose of shutting off the supply of fuel when the apparatus is not in operation.

Referring now to Figures 8, 9, 10 and 11 of the drawings, within the chamber G, of the fuel feeder 6, is a pressure-responsive device illustrated as a sylphon diaphragm 39 having bellows-like side walls which are closed at their outer extremity by. a thinplate in the form of a disc 40, and which side walls are secured to the gasket 25, the construction being such that the diaphragm is formed an integral part of the gasket.

and it is therefore held in position within the chamber 0 thereby. In making this pordtion of the apparatus care is taken to see that the disc 40 andthe asket 25 are sealed to the diaphragm 39, so t at the points therebetween wlll be air tight.

The central portion of the gasket 25 isv provided with an opening 41 through which pro ects a tubular stem 42, the outer end of the stem being swivelled to the disc 40 by a ball and socket connection 43. The inner end of the stem 42 is swivelled to the free end of a lever 44 by means of a ball and 46 will be compressed and therefore it will serve as a shock absorber for the delicate parts of the mechanism.

As the opening 41 in the gasket 25 is rela-v tively large, it will readily be seen that the interior of the diaphragm 39 will be directly in communication with the portion E, of the inlet chamber, and hence the pressure of any fluid within such chamber portion will also be present in the diaphragm; and, I

as the exterior of the diaphragm 39 1s locatedin portion C, of the inlet chamber, the pressure of any fluid within such latter chamber portion willact against it and also againstthe disc 40 forming the end. ofthe diaphragm.

Projecting into the diaphragm 39- from the face of the gasket 25 is a plurality of posts 48, which terminate adjacent to the with the posts 48 and projecting towards the disc 40, is a plurality of lugs 49. The

- disc 40, while formed on the inner surface of the end of the casting 23, in alignment purpose of the posts 48 and lugs 49 is to prevent the diap ragm 39 from expanding or collapsing beyond its elastic limit in case of a heavy unbalanced pressure, as will be readily understood.

The lever 44 is mounted on one end of a rock-shaft 50 carried by a bracket 51 fixed on the opposite'side of the gasket 25 from the diaphragm 39. This lever and its associated parts are therefore mounted in the chamber E of the fuel feeder. To the end of the shaft 50 opposite to the lever is fixed another lever 52, Which projects from the shaft at an angle ofiabout90- to the lever 44, and hence it will be seen that the lever 44, shaft 50, and lever 52, form a bellcrank that is actuated by the expansion and contraction of the diaphragm 39."

The purpose of thisbell-crank is to raise and lower a needle 53 swivelled to the end of the lever 52, said needle being slidably mounted in atubular post 54' threaded into the bottom of the central portion 22, the lower end of the post being positioned in chamber H of the fuel feeder. Near the. bottom of the post 54, there is formed a tapered seat 55 for the point 'of the needle 53. Lateral passages 56 are formed in the lower portion of the post above the seat. Therefore, when the needle 53 is seated, the flow of fuel from the chamber H to chamber E is prevented, but when the needle is raised, the fuel is free to flow upwardly into the post 54 and through the passages 56 into the chamber E. As shown by Figure 10, the needle 53 is somewhat less in diameter than the bore through the post 50. However, the needle is provided with spaced collars 57, which act as guides to keep the needle in axial alignment with its seat.

In constructing the operating mechanism for the needle 53, a safety release is incorporated in the lever elements, so as to prevent destruction of the several parts in case of a heavy unbalanced pressure tending to close theneedle. The means comprising this safety release consists in providing the hub of the lever ,44 with notches 58 which are normally engaged by an .arm 60 and an extension thereof, in the form of a stud 59, jprojecting through the shaft at an angle to the lever 44. said arm engaging one of the notches, while the stud engages the other notch. Connecting the extremity of the arm and the lever v44' is a coiled spring 61, (see Figs. 10 and 11). The purpose of the spring 61 is to hold the notches 58 against stud 59 and arm 60. In normal operation this will cause the lever and shaft to move together as one, but if a heavy force is exerted, threatening to destroy the mechanism, the spring 61 will expand and the stud 59 and arm .60 will ride off of the notches 58 until the, disc 40 comes into contact with its stops. When the force is relieved, the spring 61 will pull the shaft 50 and the lever 44 back into their normal relation to each other. The spring 61 is stifi enough to close the needle 53 a ainst the normal'fuel pressure but not sti nism.

Threaded into the wall separating chamber E from chamber Fis a plug 62 carryin one or more perforated plates 63. The fue enters chamber E through the perforations 56 in the post 54 when the needle 53 is raised. From this chamber the fuel through the plate or plates 63 of the p ug 62 into chamber -F, a passage 64 being formed in the portion 22 of the housing as a lateral extension to suchchamber, as shown by Figures 8 and 10. A plug 65 is threaded into the exterior wall of the portion-22 of the housing in axial alignment with the lug 62. The plug 65 is made larger in enough to disrupt the mechaiameter than the plug 62, so that when it is removed, the plug 62 can be withdrawn for cleanin or inspection, as willbe readily understoo By providing the plug 62 with two or more perforated plates arranged in series it will be seen that a high pressure dro can be obtained without making the size 0 the erforations in the plates so small that tey will clog.

Within the chamber D, of the fuel feeder 6 is a second pressure responsive device also illustrated as a syl hon diaphragm 66 having bellows-like si e walls which are closed at their outer extremity by a thin late in the form of a .disc 67, and which si e walls are secured to the gasket 26, the construction asses T being such that the diaphragm is formed an integral part of the gasket and it is therefore held in position within the chamber D thereby. In making this portion of the apparatus care is taken to see that the disc 67 and the gasket 26 are sealed to the diaphragm 66, so that the points 'therebetween will be air tight.

large, it will readily e seen that the interior of the diaphragm 66 will be directly in communication with the chamber portion F, of the outlet chamber, and hence the pressure ;of an fluid within such chamber portion Will a so'be present in the diaphragm. -And as the exterior of the diaphragm 66 is located in chamber portion D of the outlet chamber, the. pressure of any fluid Within such latter-chamber portion will act against it and also against e .disc 67 forming the end thereof.

Mounted inthe tube 69 is a cylindrical spacerblock 71, having one endrecessed for mamas enga ement withthe ball and socket connec-i provided so'that'the fuel can pass unrestrict tion 0, and its other end recessed for receiving the spherical end formed on the extremity of a lever 72. A cylindrical block .-7 3 which engages the other slde of the spher ical end of the lever closes the endofthe tube 69. Th t r 11d fthe block 73 is rovided e on e p ofi of its seat, the fuel in chamber F is free to pass upwardly through the post 83 into the chamber G from whence itflows through with a slot in which is inserted the cross-piece of a U-shaped yoke 74., A pair of spr1ngs 75 are connected to the free ends of the yoke 74 and to pins 76 projecting frpm the tube 69. The. purpose of the sprmgs 75 1s to retain the parts within the tube 69 in position, but if for any reason the mechamsm directly acted on by the parts shouldbind,

or fail to function properly, it will be seen that the springs will expand thereby rel eving such pressure.

\ derstood.

Projecting into the diaphragm 66 from the face of the gasket 26 is a plurality of posts 77', which terminate adjacent to the outer extremity of the diaphragm, while formed on the inner surface of the end wall of the casting 24 in alignment with the posts 77 and projecting towards the disc 67, is a plurality oflugs 78. The purpose'of the posts 77 and lugs 78 is to prevent the diahragm 66 from expanding or collapsing heyond its elastic limit in case of a heavy unbalanced pressure, as will be readily un- The lever 72 is mounted on one end of a I rock-shaft 79 carried by a bracket 80 fixed the diap on the-opposite side of the gasket 26 from ragm 66, the lever and 1ts associated parts therefore being mounted n the chamber F. To the end of the shaft 79 opposite to the lever 72 is mounted another lever 81 which projects from the, shaft at an angle of about 90 to the lever.72, and hence it will be seen that the lever 72, shaft 79, and lever 81, form a bell-crank, that is actuated by the expansion and contraction of the diaphragm 66. v

The purpose of this bell-crank is to raise and lower a valve 82 swivelledto the end of lever 81, said valve bein slidably mounted in a tubular post 83 t readed into the top of' the central portion 22 of the fuel feeder, the head of the post being located in chamber G. In this manner the post serves as means for connecting chambers F and G and allowing the flow of fuel therebetween when the valve is raised. The upper end of the valve is provided with an .en-

larged head .84, the lower portion of which edly from the chamber F to the chamber G when the valve is raised, the fuel entering the 50st '83 through lateral passages 88 locate head 84 is seated, the fuel is retained in below the seat 85. .When the valve chamber F, but when the valve head is raised the pipe 3 to the burner.

In constructingthe operating mechanism for the valve 82, a safety release is incorporated in the lever elements so as to prevent destruction of the several parts in case of a heavy unbalanced pressure tending to close the valve. The means comprising this safety release consists in providing the hub of the lever 81 with a notch 89, which is normally engaged by a pin projecting from the shaft ".9 at an angleto the lever. Projecting from the lever 81 at an angle to the pin 90 is an arm 91. Connecting the extremity of the arm and the pin is a coiled spring 92 see Figures 12 and '13). The purpose of t e spring 92 is to hold the notch 89 against the pin 90. In normal operation this will cause the lever and shaft to-move together as. one, but if a hea force is exerted, threatening to destroy t e mechanism, the sprin 92 will expand and thepin 90 will ride'o of the notch 89 until the disc 67 comes into contact with its stop. When the force is relieved, the spring 92 will pull the shaft 79 and the lever 81 back into their normal relation with each other.

Operation.

stituting the value for static head as mentioned above it will be seen that the pressure 1n chamber B equals the pressure in chamber A minus twice the velocity head at X. In other words, thepressure difference between chamber A and chamber B will be double the velocity head at the tip of the Pitot tube 21.

of the weight of air passing per's'econd, therefore the. ressure difference between chamber A an chamber B is proportional to the rate of air flow squared. As chambers A and B of the air feeder 5 are connected to chambers O and D of the fuel feeder 6, by the pipes '28 and 29 respectively,

Velocity head is proportional to the square then the pressure in chamber'C will equal the pressure in chamber A and the in chamber D will equal the pressure in 1 chamber B. v 1 Assumin 4 open and t e valve 4 is closed, as the'valve that the valves- 8 and 38 are a 4 is opened the air in chamber A'commences the fuel to flow to the burner while mainto flow through the Venturi tube 11 into the pipe 2., This movement of the air is transferred as above described to the diaphragms- 39 and 66 in the fuel feeder. The diaphragm 39 and the mechanism actuating valve 53 arelocated on'the incoming'side of the fuel feeder, and are so arranged that the fuel will be admitted to chamber E, -until the fuel pressurejin chamber E becomes equal to the air pressure in'chamber C, and will' then maintain this equality automatically.

From chamber E the fuel flows through the lug 62 into chamber F, building up the el pressure in such chamber until it balances the air ressure in chamber D. Then theoutlet v'a ve 82 will rise and allow squared, therefore the pressure inchamber" E minus the pressure in chamber F is proportional to the weight of the air passing per second squared.- In other words, the

ressure. dilference through the perforations 1n thePlates 63 of the plug 62 is propor:

- tional'to the square of the weight of air flowing. In any apparatus of this character having a plug provided. with perforated plates 63, the rate of flow of a liquidis proportional to the square-rootof the pressure difference across it, and therefore the weight of fuel passing per second is proportional to the square-root of the pressure in chamber E minus the ressure in chamber ,F, but' the pressure in c amber E minus the pressure in chamber F is proportional to the weight of the air passing er second squared, therefore theweight of fuel passing per secon is proportional to the square-root of the weight of the air passing per second squared, or t 0nd is proportional to the weight of the air passing per second. That is to say the ratio of air to fuel delivered to the burner through pipes 2 and 3 will be constant.

As th flow ofcombustible fluid is controlled only b the difference between the pressures in c ambers E and F, the flow will not be affected by any pressure or suction developed between the fuel feeder and the burner, so long as this does not exceed 7 the pressure in chamber F.

e weight of the fuel passing per sec- In the operation of the apparatus, the valve 4 i's'opened slightly, thereby allowing a slight amount of air to escape throu h the burner. Then'the valve 38 isopene com- .pletel admitting fuel to the fuel feeder eing actuated by the air- T e feeder 6 feeder 5 allows the proper amount of fuel,

to the burner and-'if a lighte torch be held in front of the burner it will be ignited. To

alter the amount of heat supplied by the burner it is necessaryonly to open or shut the valve 4 in the air line. To shut down the burner the valve 381 is first'closed completely and then the valve 4 is closed. To'

corresponding to the air bein used, to flow alter the ratio of fuel to air being used, the

Pitot tube 11 is screwed into supply more fuel or out for less. When adjusted it is fastened in place by the lock nut 19. Large changes in adjustment permitting the apparatus to be adapted to burners of various sizes and types canbe made by altering the sizes of the perforations in the plug 62 and the throat 11.

One purpose of the valve 32 is to enable primin of the burner when'the same is cold, wlthout altering the adjustment-of theair andfuel mixture.

When the valve is turned to the position shown by Figure4 to break the line from chamber B to D chamberD will be opened to atmosphere.

d Releasing the pressure in chamber D causes the diaphragm 66'to move outward to its limit, t ereby opening the valve 82 wide. This causes a complete loss of pressure in chamber F. Chamber E will still containfuel at pressure equal to that in chamberA which will result in a greatly increased flow of fuel. This flow can be checked and controlled by means of valve 38, inwhich case the pressure in chamber E will be lost and.

the pressure in chamber C will cause diaphragm 39 tomove inwardly to its limit, opening valve 53 .wide..

The burner can now be operated by manipulatin valves 4 and 8 in the usual manner, the eeder being entirely out of opera-' tion. Upon throwing the valve 32 into the operating position, the pressure in chamber B will be again communicated to chamber d D and this causes the outlet valve 82 to close until the pressure in chamber F equals the pressure in chamber D. This action reestablishes the pressure in chamberE bringing the inlet 'valve 53 back into its normalposition. Valve 38' is then opened wide and the feeder will function. 1

This feature is very valuable and important, because it is practically impossible to start .up a cold burner on an oil-air ratio that would be satisfactory after the burner became hot. Without the valve 32, it would be necessary, therefore, to alter the mixture adjustment every time the burner was lighted up. By starting the burner with the chambers into communication with each.

-1,ees,14p-

valve 32 moved to break the line between chambers B and D and then throwing such other when the burnerhas become hot, the

mixture adjustment can be left fixed so thatthe same conditions can be obtained, even though the burner is extinguished periodical a.

e valve 32 also provides a quickand convenient way of flushing out the valves 53 and 82 in case sediment collects under them. This can be done without taking anything apart, without changing adjustments, and without interrupting the fire, ,exceptthere will be a heavy flow of oil to the burner during the flushing process.

The fore oing detailed description has been given or purposes of illustration, and no undue limitations should be deduced therefrom, but the following claims should be construed as broadly as permissible, in view of the prior art.

Having thus described my invention what I claim as new, and desire to secure by Leta ters Patent is 1. The combination with a burner having air supply and fuel supply lines, of an air feeder in the air supply line including a chamber subjected to the pressure in the air suppl line, and a second chamber, means for o taining a pressure difference between these chambers dependent on the quantity of air passing to the burner, and a fuel feeder in the fuel suppl line through which the fuel-passes, inclu ing an inlet valve having operating mechanism under control of the pressure in the first chamber, and an outlet valve having operating mechanism under control of the pressure in the second chamber.

' 2. The combination with a burner having air supply and fuel supply lines, of an air feeder in the air supply line including a chamber subjected to the pressure in the air supply line, and a second chamber, 'means for obtaining a pressure difference between these chambers dependent on the quantity of air passing to the burner, and a fuel feeder in the fuel supply line including an inlet valve having operating mechanism under control of the pressure in the first chamber, and an outlet valve having operating mechanism under control of thepressure in the second chamber, and means whereby the pressure difference between the chambers may be varied. c W

3. The combinationwith a burner having air supply and fuel supply lines, of an airfeeder in the air supply line including a chamber subjected to the pressure in the air supply line, and a second chamber,means for obtaining a pressure difference between these chambers dependent on the quantity of air passing to the burner, and a fuel feeder in the fuel supply line including an inlet will.

mechanism under control of the pressure in the second chamber, and means for main-- taining a pressure drop between the said valves.

4. The combination with a burner having air sup ly and fuel supply lines, of an air feeder 1n the air supply line including a chamber subjected to the pressure in the air suppl line, and a second chamber, means for o taining a pressure difference between these chambers dependent on the uantity of air passing to the burner, and a uel feeder in the fuel supply line including an inlet valve having operating mechanism under control of the pressure in the first chamber, and an outlet valve having operating mechanism under control of the pressure. in the second chamber and means whereby the pressure controlling the operating mechanism of the outlet valve may be released at inlet valve having operating mechanism under control of the pressure in the first chamber, and an outlet valve having oper ating mechanism under control of the pressure in the second chamber, .and' means whereby the pressure controlling the operating mechanism of the outlet valve may be released at will without affecting the pressure controlling-the operating mechanism of the inlet valve.

6. The combination with a burner having air supply and fuel supply lines, of an air feeder in the air supply line including a chamber subjected to the pressure in the air supply line, and a second chamber, means for obtaining a pressure difierence between these chambers dependent on the quantity of air passing to the burner, 'said means being adjustable for varying the pressure difference, a fuel feeder in the fuel supply line including an inlet valve having operatlng mechanlsm under control of the pressure n the first chamber, and an outlet valve hav ing operating mechanism under control of the pressure in, the second chamber, and means for maintaining a pressure drop between the said valves.

7. The combination with a burner having air supply and fuel supply'lines, of an air feeder in the air supply line including a chamber subjected to the ressure in the air supply line, and-a secon chamber, means these chambers ependent 'on the quantity of air assing to the burner, said means bein "a justable forvarying the pressure difierence, a fuel feeder in the fuel supply line including an inlet valvehaving operating mechanism under control of the pressure in the'first chamber, and-an outlet valve having operating mechanism under control of the pressure 1n the second chamber, and means wheneby the pressure controlling the operating mechanism of the outlet valve may be released at will. 8. The combination with a burner having air sup ly and fuel supply lines, ofan air feeder m the air sup lyline including a chamber subjected to t e ressure in the air supply line, and a secon chamber, means for obtaining a pressure difference between these chambers dependent on the quantity of air passing to the burner, said means being adjustable for varying the pressure difierence, a fuel feeder in the fuel supply line including an inlet valve having operating mechanism under control of the pressure in the first chamber, and an outlet valve having operating mechanism under control of v the pressure in the second chamber, means for maintamin a pressure-drop between the said valves, an means whereb the pressure controlling the operating mec anism of the outlet valve may be released at will.

9. The combination with a burner having air supply and fuel sup ly lines, of an air feeder\1n the air sup y line including a chamber subjected to t e pressure in theair suppl line, and a second chamber, means for o taining' a pressure difference between these chambers dependent on the quantity of air assingto the burner, said means being a djustable for varying the pressure difference, a fuel feeder'in the fuel supply line including an inlet'valve having operating mechanism under control of the pressure in the first chamber, and an outlet valve having operating mechanism under control of the ress'ure in the second chamber, means 'formamtalnln a pressure drop between the said valves, an means whereby the pressure controlling the operating mechanism of the outlet-valve may be released at will without affecting the pressure controlling the operating mechanism of the inlet valve.

. 10. The combination with a burner, of an air feeder including a chamber subjected to the pressure of the air supply for the burner, and a second chamber, means for.

maintaining a pressure in the second chamber which differs from the pressure in the;

first chamber by an amount dependent on the quantit of air passin to the burner, and

a fuel eeder having in ct and outlet valves,

respectivel under control of' the pressures ii; the sai chamber and said second cham- Y I 11. The combination with a burner, of an differs from the pressure in the first chamber by an amount dependent on the quantity of air passing to the burner,'a fuel feeder having in ct and outlet valves,-respectively,

under control of the pressures in the said,

chamber and said second chamber, and

means whereby the pressure difference between the chambers may be varied.

- 12. The combination with a burner, of an air feeder including a chamber subjected to the pressure of theair supply for the burner,

and a second chamber, means for maintaining a pressure in the second chamber which differs from the pressure in the first chamber by an amount dependent on the uantity of air passing to the burner, a fuel eeder having inlet and outlet valves, respectively, under control of the pressures in the said chamber and said second chamber, means whereby the pressure difference between the chambers may bevaried, and -means for maintaining a pressure drop between the said valves.

13. The combination with a burner, of an air feeder including a chamber subjected to the pressure of the air supply for the burner, and a second chamber, mean's for maintainin a pressure in the second chamber which di ers from the pressure in the first chamber by an amount dependent on the quantity of air passing to the burner, a fuel feeder taining a pressure drop between the said valves, and means whereby the pressure controlling the outlet valve may be released at will.-

14. The combination with a burner, of an air feeder including a chamber subjected to the pressure of the air supply for the burner, and a second chamber, means for maintaining a pressure in the second chamber which differs from the pressure in the first chamber by an amount dependent on the quantity of air passing to the burner, a fuel feeder having inlet and outlet valves, respectively, undercontrol of the pressures in the said chambei and said second chamber, means whereby the'pressure difference between the chambers may be varied, means for maintaming a pressure drop between the said,

valves, and means whereby the pressure controlling the outlet valve may be. released at will without affecting the pressure controlling the inlet valve.

15. The combination with a burner, of an air feeder including a chamber subjected to and a second chamber, means for maintainber by an amount dependent on the quantity 'ing a pressure in ing a pressure in the second chamber which differs from the pressure in the first chamber by an amount dependent on the quantity of air' passing to the burner,- said means being adjustable for varying the pressure differ'ence, and a fuel feeder having inlet and outletvalves the pressures in the said chamber and said second chamber.

16. The combination with a burner, of an air feeder including a chamber subjected to the pressure of the air supply for the burner, and a second chamber, means for maintainthe second chamber which differs from the pressure in the first chamber by an amount dependent on the quantity of air passing to the burner, said means being ad ustable for varying the pressure-difference, a fuel feeder having inlet and out: 'let valves, respectively under control of the pressure in the said chamber and said second chamber, and means for maintaining a pressure drop between the said valves.

17. The combination with a burner, of an air feeder including a chamber subjected to the pressure of the air supply for the burner,

and a second chamber, means for maintain ing a pressure in the second chamber which differs from the pressure in the'first cham of air passing to the burner, said means being adjustable for varying the pressure difference, a fuel feeder having inlet and outlet valves, respectively, under control of the pressure in the said chamber, and said second chamber, means for maintaining a pressure drop between the said valve, and means whereby the pressure controlling the outlet valve may be released at will.

18. In an apparatus of the class described,

- anair feeder including separate chambers subjected to pressures which difier by an amount dependent upon the quantity of 'air passing feeder including an inlet chamber and an outlet/chamber, and means for maintaininga pressure drop therebetween, a diaghragm in each of the fuel feeder chambers, said diaphragms being respectively subjected on one side of the pressures malntained in the respective chambers of the. air feeder, and on their opposite side to the fuel pressures in the respective fuelfeeder chambers, an inlet valve u'nder control of the diaphragm in the inlet chamber, and an outlet valve under control of the diaphragm in the outlet chamber. 1 I

19. In an apparatus of the class described, an air feeder including separate. chambers subjected to pressures which differ by an amount dependent upon'the quantity of air passing throu h one of said chambers, a fuel feeder includmg an inlet chamber and an respectively, under control ofv through one of said chambers, a fuel outlet chamber, and means for maintaining a pressure drop therebetween, a diaphragm in each of the fuel-feeder chambers, said diaphragms being respectively subjected on one side to the ressures maintained in the respective cham ers of the air feeder, and on the other side to the fuel pressures in the respective fuel feeder chambers, and fuel inin each of the uel feeder chambers, said (118/- phragms being respectively subjected on one side to the pressures maintained in the respective chambers of the air feeder, and on 21. In an apparatus of the class described, 'an air feeder including separate chambers subjected to pressures which differ by an amount dependent upon the quantity of air passing through one of said chambers, a fuel feeder including an inlet chamber and an outlet chamber, and means for maintaining a pressure. drop therebetween, a diaphragm in each of the fuel feeder chambers, said diaphragms being respectively subjected on one side to the pressures maintained in the re- -s ective" chambers ofthe air feeder, andon t e other side to the fuel pressures in the respective fuel feeder chambers, fuel inlet and outlet control means under control of the respective diaphragms, and means whereby the difference between the pressures in the air feeder chambers may be varied at will.

22. In an apparatus of the class described, an air feeder mcluding separate chambers subjected to pressures which differ by an amount dependent upon the quantity of air passing through one of said chambers, a fuel the other side to the fuel pressures in the respective fuel feeder chambers, fuel inlet 6 Ill feeder including an inlet chamber and an.-.

outlet chamber, and means for maintaining a pressure drop therebetween, a diaphragm in each of the fuel feeder chambers, said diaphragms being respectively subjected on one side to the pressures maintained in the respective chambers of the air feeder, and on the other side to the fuel ressures in the respective fuel feeder chain ers, fuel inlet and outlet control means under control of the respective diaphragms, means whereby the air feeder chamber pressure on the diaphragmcontrolling the outlet control means whereby the difference between the pressuresin the air feeder chambers maybe variedf'atwill.

'23. In an apparatus of the class described,

' sure res onsive arranged n a fuel feeder having inlet and outlet ports,

and means for maintaining a pressure drop therebetween, pressure responslve devices respectively controlling the inlet" and outlet ports, means for subjecting the pressure re-- sponsive devices to different pressures, means for varying this difference at will, and means for releasing the ressure on one of the pres d vices at will. 24. T e combination with aburner, of a .fuel-feedefincludin inlet and outlet ports through which the uel flows to the burner, and including pressure responsive means con-- trolling the ports, and means operated by the ply passes, a tx'cond' c amber, a Pitot tube e Venturi throat and communicating with the Santa h mber; an so T fuel control pressure 'resp0 ;1s ye fd respectively in communication; with said chambers.

.26. The combination with a burner, of an air feeder includin a chamber; inserted in the air line to the ply passes, a second chamber, a Pitot tube arranged in theVenturi throat aildcommunieating with the second chamber,said Pitot tube being adjustable relatively-to: the Venturi throat, and fuel control-pressure responsive devices respectively in'communication with said chambers, p 27. The combmatlon with'a burner, of an an feeder mcludlng a chamber gund-er pres-t.

sure of an air supply to the burner,-,asecond chamber m'e'ansfor obtainin a pressure difference b 7 on the quantity of air passing to theburner, said means bein adjustable forvarying this etween these cham ers dependent u i "rner, aveirturi throat" .in said chamber throughwlnch'the afi difference, and uel control pressure respdnsive devices respectively in communication with said chambers. F

In testimony whereof I hereunto'aflix'my signature. 1

GORDON PELTZ. 

